Rivet-set retainer.



W.- H. ARM

ERI

Patented Jan. 2, 1917,

WILLIAM H. ARMSTRONG, OF PLAINFIELD,

NEW JERSEY, ASSIGN OR TO INGERSOLL- RAND COMPANY, OF JERSEY CITY, NEWJERSEY, A CORPORATION OF NEW JERSEY.

RIVET-SET RETAINER.

Application filed October 29,

To all whom it may concern:

Be it known that I, WILLIAM H. ARM- s'rnoNo, a citizen of the UnitedStates, residing at Plainfield, in the county of Union and State of NewJersey, have invented a certain new and useful Improvement in Rivet-SetRetainers, of which the following is a specification.

This invention relates to tool retainers for percussive tools and moreparticularly to such a retainer for use in holding in the rivet set in ariveting hammer.

The object of the invention is to provide such a retainer which will beof comparatively simple construction and yet capable of bearing thegreat stress which these retainers are often subjected to, for such aperiod of time that any chance of accident will be practicallyeliminated.

lVith this object in view, I have devised a rivet set retainer apractical embodiment of which is shown in the accompanying drawings inwhich:

Figure 1 shows an end elevation of the tool and retainer with the headof the rivet set removed, Fig. 2 is a longitudinal section taken on theline II-II of Fig. 1, Fig. 3 is a transverse section taken on the lineIIIIII of Fig. 2.

In Fig. 2 is shown the forward end of the barrel of the riveter 1, ofordinary construction, having a forward cylindrical portion 2 in whichslides the shank 3 of a rivet set which comprises a head 4 and a neck 5,a flange 6 being provided between the shank and the neck to limit therearward move ment of the rivet set and to furnish a holding surface forthe rivet set retainer.

The retainer proper comprises a sleeve 7 having inturned flanges 8 and 9at each end contacting with the cylindrical portion 2 of the toolbarrel. This sleeve 7 is secured at its rear end to the tool barrel byany suitable means, being here shown as provided with opposite slots 10in the rear flange 9 which slide over lugs 11 on the outer surface ofthe barrel, the sleeve 7 being turned on the barrel slightly, after ithas been slid into place so that the slots 10 do not register with thelugs 11. Inside of the sleeve 7 is a spring 12 which is placed in thesleeve before it is slid Copies of this patent may be obtained for fivecents Specification of Letters Patent.

Patented Jan. 2, 1917.

1913. Serial No. 797,979.

on to the tool barrel. Slidably mounted in slots 13 in the sleeve 7 aredogs 14 which are provided on their front ends with jaws 15 for graspingthe rivet set and on their rear ends with inturned lugs 16 for engagingthe rear end of the spring 12. To retain the dogs 14 in position a ring17 is provided which surrounds the sleeve 7 and is secured thereon byrearwardly projecting lugs 18 which have grooves in their inner facesadapted to slide on to ridges 19 on the outer surface of the sleeve 7.

The operation of the device will be evident from the above description.If the tool is started accidentally when the rivet set is not in contactwith the work the impact of the flange 6 will be taken up by the dogs 14which will be moved forward against the resistance of the spring 12, theforce of the piston blow being thus cushioned and the rivet setprevented from flying out of the cylinder.

Although the retainer is here shown in connection with a riveting tool,it is adapted for use with any form of percussive tool or drill wherethe tool or drill is loosely held in the cylinder and it is to beunderstood that the present showing and description discloses only onespecified modification of my invention and other forms and modificationsare included in the spirit and scope of the invention as expressed inthe claim.

hat I claim is:

In a tool retainer for percussive tools, a tool cylinder, a sleevesurrounding the forward end of the tool cylinder and secured thereonagainst longitudinal movement, said sleeve having an inturned flange, aspring inside of said sleeve engaging said flange, a dog mountedslidably in said sleeve, said dog having a tool grasping jaw and aninturned lug for engaging the rear end of said spring, and means forholding said dog in position.

In testimony whereof, I have hereunto set my hand.

WILLIAM H. ARMSTRONG.

Witnesses:

STANLEY A. KLINGER, ALICE C. BRORSTROM.

each, by addressing the "Commissioner of Patents,

Washington, D. G.

